Market Breadth Analysis: Advance-Decline Ratio & High-Low Index in Nifty

Why Market Breadth is the Ultimate Truth Detector

Headline benchmark indices like the NIFTY 50 and Sensex are market-capitalization weighted. This means that a sharp rally in just 3 or 4 index heavyweights (such as Reliance Industries, HDFC Bank, and TCS) can cause the index to rise even while 80% of individual stocks are falling.

Market Breadth measures the underlying participation of all listed equities to determine whether a market rally is healthy and sustainable or a deceptive narrow trap.

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Key Market Breadth Indicators

1. The Advance-Decline (A/D) Ratio

$$\text{A/D Ratio} = \frac{\text{Total Number of Advancing Stocks}}{\text{Total Number of Declining Stocks}}$$

• A/D Ratio > 2.0: Strong broad-based buying across large, mid, and small-cap segments.
• A/D Ratio < 0.50: Severe widespread selling across the broader market.

2. Identifying Breadth Divergences (Warning Signs)

• Bearish Breadth Divergence: NIFTY 50 prints a new all-time high, but the Advance-Decline line fails to make a new high and trends downward. This indicates that fewer and fewer stocks are supporting the rally—a classic precursor to a market correction.
• Bullish Breadth Divergence: NIFTY 50 makes a lower low, but the A/D line makes a higher low. This indicates that broader market selling has dried up and a bottom is forming.